Robert S. Ridgely and Paul J. Greenfield ; with the collaboration of Mark B. Robbins and Paul Coopmans ; in association with the Academy of Natural Sciences ; [foreword by Frank B. Gill]
Comstock2001The birds of Ecuador / Robert S. Ridgely and Paul J. Greenfield
v. 2
Robert S. Ridgely and Paul J. Greenfield ; with the collaboration of Mark B. Robbins and Paul Coopmans ; in association with the Academy of Natural Sciences
Comstock2001The birds of Ecuador / Robert S. Ridgely and Paul J. Greenfield
v. 1